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Vacuum Roots pump set and its control method

A Roots pump and unit technology, applied in pump components, mechanical equipment, machines/engines, etc., can solve the problems of motor power grid shock, power grid overload and power failure, power grid voltage fluctuation, etc., to achieve completely smooth operation, reduce workload, The effect of prolonging the service life

Inactive Publication Date: 2003-03-26
北京丹普表面技术有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] 2. Since the Roots pump motor has the heaviest load when it starts, the motor will be overloaded momentarily, causing an impact on the power grid, and thus causing instantaneous fluctuations in the power grid voltage, and even partial power failure due to overloading of the power grid
Especially for Roots pumps with high pumping speed, the overload of the motor and the impact on the grid will be more serious

Method used

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  • Vacuum Roots pump set and its control method
  • Vacuum Roots pump set and its control method
  • Vacuum Roots pump set and its control method

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Embodiment Construction

[0020] The vacuum Roots pump unit designed by the present invention, such as figure 2 As shown, it includes Roots pump 1, rotary vane mechanical pump 3, AC contactor 4, and current overcurrent protector 5. Roots pump 1 and rotary vane mechanical pump 3 are connected through pipelines, and AC contactor 4 and current overcurrent The protector 5 is connected with the rotary vane mechanical pump 3 in sequence. The unit also includes a frequency converter 6, which is connected to the motor of the Roots pump 1, and the motor of the Roots pump is controlled by the frequency converter.

[0021] The control method of the vacuum Roots pump unit proposed by the present invention is to control the output frequency of the frequency converter, and then control the rotating speed of the Roots pump motor. The minimum time required for the vacuum degree of the vacuum system to go from the atmosphere to the vacuum degree of 10Pa × (1±50%).

[0022] It takes 20 seconds to 180 seconds for the ...

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Abstract

A vacuum Roots pump group and the controlling method thereof. The said group comprises Roots pump, rotary-vane machinical pump, A.C. contactor, over-current protector and frequency transformer. The frequency transformer is connected with and controls the motor of Roots pump. The method of controlling the vacuum Roots pump is using transformer to control the Roots pump motor. The time needed for transformer front start to outputting normal work frequency is equal to the minimum time X(1 minus or plus 50%) degree of the vacuum system connected to Roots pump from the atmosphere to 10a. The method and device of the invention drive the Roots pump to start slowly, thus prevents from the machinery impact and interfere to the inner parts and power network.

Description

technical field [0001] The invention relates to a vacuum Roots pump unit and a control method thereof, belonging to the technical field of vacuum equipment. Background technique [0002] Vacuum Roots pump unit is a commonly used equipment for obtaining vacuum. It is mainly composed of a Roots mechanical vacuum pump and one or more single-stage or two-stage rotary vane mechanical vacuum pumps connected in series. When the Roots pump is working normally, the maximum pressure difference between the outlet and the inlet is about 4000Pa, and the backing vacuum is provided by the rotary vane mechanical pump to achieve the basic working conditions of the Roots pump. [0003] The general Roots pump and rotary vane pump vacuum unit first use the rotary vane mechanical pump to pump from the atmosphere to a vacuum of 10000Pa or more, and then turn on the series Roots pump to accelerate the vacuum to above 10Pa. In order to avoid obstruction of the vacuum pipeline when the Roots pump ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 董骐文学春刘相武田俊瑞罗蓉平杜建钟钢
Owner 北京丹普表面技术有限公司
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